There are three things people will have skill issues, will issues or too lazy to do things. Definitely skill issues can be addressed will issues and laziness are the toughest ones to handle for any manager but a good manager would handle them too.
Will issue for many reasons like,
I don’t know the skill gap and I don’t want to know or bridge the gap either as that shows my shortfall and make me feel inferior.
My Company doesn’t recognise me why should I work more.
I have so much to deal with in my personal lives. I am executing my job with the best possible efforts. My Manager should be happy that at least I’m coming to office and not taking leaves.
If I do more, I will be asked to do the most and expectations will be endless.
Oh I’m doing so much let others do.
Let me find someone who can do and I will take the credit of it.
Let me pass on to a Junior who will have to do it to make me his Senior happy.
Let me do it later when it is really required.
Let me behave ignorant else I will have to do it.
Let me throw some impressive bunch of words so that words will satisfy my manager.